There's a plenty of large 4K monitors for reasonable price these days
e.g. http://is.gd/7I8oy0
They use IPS technology and 60 Hz freq. which makes them the same quality as smaller monitors. We live in great time
Having one 48'' 4K LCD is the same as having four 24'' FHD LCDs. The size and resolution of graphics will be the same.
Just make sure your graphic card is capable of this resolution (with DisplayPort 1.2 or HDMI 2.0)
e.g. http://is.gd/7I8oy0
They use IPS technology and 60 Hz freq. which makes them the same quality as smaller monitors. We live in great time

Having one 48'' 4K LCD is the same as having four 24'' FHD LCDs. The size and resolution of graphics will be the same.
Just make sure your graphic card is capable of this resolution (with DisplayPort 1.2 or HDMI 2.0)